You just never know, Honey. I'm so sorry he was traumatized and I'd go in
(with him) and ask what happened (watch his reactions to them & the place).
After seeing a dog fall off the groomers bench and dangle by his collar/leash,
I only take mine if I have the time to be there, watching.
Praying for him that he forgets the memory. GOD bless y'all